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From: topher@cyb-eng.UUCP (Topher Eliot)
Newsgroups: net.micro.pc
Subject: Re: Speeding up the AT
Message-ID: <455@cyb-eng.UUCP>
Date: Thu, 15-Nov-84 12:46:06 EST
Article-I.D.: cyb-eng.455
Posted: Thu Nov 15 12:46:06 1984
Date-Received: Sat, 17-Nov-84 20:00:43 EST
References: <2652@csu-cs.UUCP>
Distribution: net
Organization: Cyb Systems, Austin, TX
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> I was just reading in InfoWorld that it is possible to speed up
> the PC/AT.  According to the latest InfoWorld, somebody pulled out
> the 12 mhz chip, and put an 18 mhz crystal in (the crystal is socketed,
> not soldered).  It worked, except for the 80287, a diagnostics program,
> and some clock-sensitive software, such as communication programs.
> It looks like IBM can speed the AT up by 50% whenever they want to.

This may be true.  However, before anyone out there either tries to soup up
their own AT, or reaches the conclusion that IBM is playing marketing/demand
games, consider whether or not it will run at 18MHz when:
	the ambient temperature reaches 95F,
	or 40F,
	or the line voltage falls 10%,
	or you get a processor chip that is somehow marginal,
	or you get a memory chip that is just a tad on the slow side,
	or you plug in one more board, loading the bus drivers that much more,
	blah, blah, blah.
Anyone who has every gone through the rigors of preparing a product for
mass production will recognize that broadcasting the conclusion that 'it
can be speeded up 50% any time you want' on the basis of one casual
experiment is a bit premature.